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Limitations of Case Studies
While case studies are useful for generating hypotheses, they have significant methodological limitations and should never be used as empirical evidence to support theories. They lack the strict experimental controls necessary for internal validity, making it impossible to determine causation or rule out alternative explanations. Additionally, because they typically focus on a single, often atypical individual, case studies suffer from poor external validity, meaning their findings cannot be generalized to the broader population. Finally, case studies are particularly susceptible to researcher bias, as the subjective nature of the analysis provides ample opportunity for the researcher's theoretical views to influence the case description.
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Research Methods in Psychology - 4th American Edition @ KPU
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Disadvantages of Case Studies
Purpose of Case Studies
Advantage of Case Studies: Understanding Exceptional Individuals
Disadvantage of Case Studies: Researcher Bias
A researcher spends three years living with and documenting the life of a single, isolated individual who has had no contact with modern technology. The researcher's goal is to draw broad conclusions about the fundamental nature of human cognition without technological influence. What is the most significant scientific limitation of using this single-person investigation to achieve this specific goal?
Benefits of Case Studies
Case of Henry Molaison (H.M.)
Case of Anna O.
The Little Albert Experiment
Comparison of Single-Subject Research and Case Studies
Which statement accurately describes the type of data collected in a psychological case study?
A researcher conducts an in-depth, year-long investigation of a single patient with a rare memory disorder. The researcher collects detailed interview transcripts, behavioral observations, and also administers standardized neuropsychological tests that yield numerical scores. Because the study includes these numerical test scores, it no longer qualifies as a case study.
A neuropsychologist is designing a study of a patient who has developed a unique ability to remember every day of their life following a rare type of stroke. Match each specific research activity to the component of the case study method it represents.
Analyze the following research scenarios. Arrange them in order based on how well they align with the unique strengths of the case study method, from the scenario where it is most appropriate (1) to the scenario where it is least appropriate (3).
Imagine you are tasked with developing a new research protocol to study a unique individual who has regained functional sight after 40 years of total blindness. To create a rigorous 'case study' that captures the full depth of this 'rare condition' through an in-depth, longitudinal approach, which of the following combinations of research tools and timelines should you synthesize into your final plan?
Case Study of Anna O.
Limitations of Case Studies
True or False: In psychological research, the case study method is strictly limited to the investigation of single individuals and cannot be used to examine social units or specific events.
Arrange the typical stages of conducting a psychological case study in their logical order, from the initial identification of the subject to the final synthesis of findings.
A researcher conducts an in-depth, longitudinal analysis of a single patient with a rare memory disorder and concludes that a specific memory technique will be effective for all humans. A critic evaluating the scientific merit of this conclusion would argue that the case study method fundamentally lacks _____, which is the extent to which findings can be applied to the broader population.
Match each defining feature of the case study method to its accurate methodological implication for how research using this approach is conducted and interpreted.
A research ethics board is reviewing a proposal to investigate a single individual who, following a specific brain lesion, has completely lost the ability to form any new long-term memories—a condition so rare that fewer than a dozen cases have ever been documented. The proposed study would collect detailed interview transcripts, naturalistic behavioral observations, and standardized memory test scores over a three-year period. A critic argues the study is scientifically worthless because it examines only one person and therefore cannot produce statistically generalizable conclusions. Evaluate this critique: the critic correctly identifies that a _____, by definition, focuses on a single individual or unit and produces findings with limited generalizability; however, this limitation does not render the method scientifically worthless, because its primary purpose is an in-depth, longitudinal description of a subject whose rare condition is inaccessible through large-sample experimental designs.
Define the case study method in psychology as an observational research approach, and identify the primary subjects (e.g., individual, social unit, or event) it can examine, as well as the types of qualitative and quantitative tools typically used to gather information during such a study.
Based on the provided case context, explain how the researchers integrated both qualitative and quantitative observational data in their case study, and explain how this combination aligns with the definition and typical structure of a psychological case study.
Suppose you are designing an in-depth psychological investigation of a small, isolated group that recently survived a rare meteorological event. If you decide to apply the case study method to this scenario, identify what the primary subject of your case study would be, and state one qualitative and one quantitative measurement tool you would use to collect your data.
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Which of the following describes a significant methodological limitation of using case studies in psychological research?
Match each methodological limitation of case studies with the specific reason it occurs in psychological research.
A researcher conducts a year-long case study on a patient who recovered from a rare phobia after using a specific herbal remedy. This extensive documentation provides the necessary internal validity for the researcher to conclude that the remedy was the definitive cause of the recovery.
A researcher attempts to use a case study to prove that a specific therapy causes recovery from a rare phobia. Arrange the following steps of a methodological critique in the logical order that explains why this case study fails to provide empirical support for the researcher's theory.
A researcher reports that a single patient's chronic insomnia disappeared after they began practicing a specific meditation technique. To analyze why this case study cannot be used as empirical evidence for a theory, arrange the logical components of a methodological critique in the correct order.
A researcher publishes an intensive case study of a single patient who recovered from a rare anxiety disorder after using a specific herbal supplement. Based on the methodological limitations of case studies, the researcher is scientifically justified in concluding that the supplement is an empirically proven treatment for the general population of anxiety patients.
Which of the following describes a major methodological limitation of case studies in psychological research?
Match each methodological limitation of a case study with the specific scientific problem it creates for psychological research.
A researcher claims that a new therapeutic technique is universally effective after observing one patient's dramatic recovery. A psychologist would reject this conclusion because a case study focusing on a single, atypical individual lacks _____ validity, making it impossible to generalize the findings to the broader population.
A researcher concludes that a successful case study of a single patient 'proves' that a new meditation technique is the direct cause of their recovery from anxiety. A scientific evaluator would judge this conclusion as invalid because case studies lack the strict experimental controls required to establish _____ validity.
Describe the three primary methodological limitations of case studies in psychological research, and identify what case studies should actually be used for instead of supporting theories.
Based on the methodological limitations of case studies, explain why this researcher's claims of treatment effectiveness and theoretical support are invalid. Address internal validity, external validity, and researcher bias in your response.
A clinical psychologist wants to test a new therapeutic hypothesis. Explain how the psychologist should utilize a case study in their research plan without violating the methodological rules regarding theoretical evidence.